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United States Patent | 6,005,199 |
Harada ,   et al. | December 21, 1999 |
A load cell comprises a column elastic body 11; a circle bore 12 formed on a center portion of a first end surface 11a of the column elastic body 11, a bottom wall of which constitutes a load acting surface 13; an annular concave groove 15 formed on a second surface 11b of the column elastic body 11 being coaxial with the circle bore 12, a bottom portion of which constitutes a strain occurrence portion 18, a outer portion of which constitutes a fixing portion 16 of thick cylinder configuration; and Strain gages stuck on the strain occurrence portion. A distance "y" from the load acting surface 13 to a surface of the strain occurrence portion 18 is 0.2 to 2 times shortest distance "e" from a center axis of the column elastic body to the strain gages.
Inventors: | Harada; Shunji (Nishinomiya, JP); Hamamatsu; Masahiro (Nishinomiya, JP) |
Assignee: | Kawatetsu Advantech Co., Ltd. (Nishinomiya, JP) |
Appl. No.: | 143524 |
Filed: | August 28, 1998 |
Aug 28, 1997[JP] | 9-232963 | |
Jan 21, 1998[JP] | 10-009456 |
Current U.S. Class: | 177/211; 73/862.474; 73/862.632; 73/862.637 |
Intern'l Class: | G01L 001/00 |
Field of Search: | 177/211 73/862.474,862.627,862.629,862.632,862.637,862.642,862.391,862.581,862.636 |
3213400 | Oct., 1965 | Gieb | 73/862. |
3284749 | Nov., 1966 | Fouretier | 73/862. |
3365689 | Jan., 1968 | Kutsay | 73/862. |
3453582 | Jul., 1969 | Birkholtz | 73/862. |
3643502 | Feb., 1972 | Birkholtz | 73/862. |
4166997 | Sep., 1979 | Kistler | 73/862. |
4744254 | May., 1988 | Barten | 177/211. |
4811610 | Mar., 1989 | Gassmann | 177/211. |
4812199 | Mar., 1989 | Sickafus | 73/862. |
5024107 | Jun., 1991 | Bethe | 73/862. |
5313022 | May., 1994 | Piroozmandi et al. | 177/211. |
5349871 | Sep., 1994 | Naganuma | 73/862. |
Foreign Patent Documents | |||
5-57630 | Jul., 1993 | JP. |